I was able to fix the problem by reading out the option bytes from a new board and write the exact same configuration to my board which had problems...

Hi, I successfully programmed the NUCLEO-WL55JC1 multiple times until I tried the FUOTA Dual Core demo like described in this video: Getting started with LoRaWAN FUOTA on STM32WL end device Since then, I had a lot of issues with reprogramming. I fina...